what weight gear oil for eaton fuller trans

I have a 13 Eaton fuller transmission. What kind of oil do I need to get

 

Straight 50w trans lube.

 

Amsoil smamsoil ! A cost to produce of $5 quart of oil in a $40 dollar plastic bottle. Poor suckers that buy into the oil scam.

 

Have a Easton Fuller Auto ultrashift what Tran fluid do I need

 

50w synthetic

 

How much oil does it take i know fill it till it comes out what a good amount to start with

 

5 gallons will be more that enough even with PTO. Most hold around 3-4 depending on the model.

 

We have been using TRC 80-90 all along is that right

 

That's what I use,1.5 million on main and countershafts, quiet as a mouse